Noun

(en noun)

(arts) A Russian movement in modern art characterized by the creation of nonrepresentational geometric objects using industrial materials.

(mathematics) A philosophy that asserts the need to construct a mathematical object to prove it exists.

(philosophy, psychology) A psychological epistemology which argues that humans generate knowledge and meaning from their experiences.

* 2000 , Donald Kiraly, A Social Constructivist Approach to Translator Education , St. Jerome Publishing, p. 18:

There is no single theory of constructivism'. In fact, there are many shades and varieties of '''constructivism''' spanning a range of perspectives. There is also no single individual who can be identified as the founder of '''constructivism'''. In fact, rather than tracing a linear development along one line of philosophical thought, ' constructivism seems to circumscribe a set of thinkers, theories and approaches that spring from a plethora of historical and cultural origins.

* {{quote-book, title=Facets of Systems Science, author=George J. Klir, year=2001 citation

, passage=According to constructivism , all systems are artificial abstractions. They are not made by nature and presented to use to be discovered, but we construct them by our perceptual and mental capabilities with the domain of our experiences.}}

Noun

(en noun)

A non-existent or empty value or set of values.

Zero]] quantity of [[expression, expressions; nothing.

(Francis Bacon)

Something that has no force or meaning.

(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.

(computing) the attribute of an entity that has no valid value.

Since no date of birth was entered for the patient, his age is null .

One of the beads in nulled work.

(statistics) null hypothesis